ygotthilf

ssh-keygen -t rsa -b 4096 -m PEM -f jwtRS256.key
# Don't add passphrase
openssl rsa -in jwtRS256.key -pubout -outform PEM -out jwtRS256.key.pub
cat jwtRS256.key
cat jwtRS256.key.pub

nepsilon

Auto-backup your configuration files with Vim

Not using versioning on your configuration files and editing them with Vim?

Use Vim’s backup option to automatically keep a copy of past versions. To put in your ~/.vimrc:

"Turn on backup option
set backup

evanwill

How to add more to Git Bash on Windows

Git for Windows comes bundled with the "Git Bash" terminal which is incredibly handy for unix-like commands on a windows machine. It is missing a few standard linux utilities, but it is easy to add ones that have a windows binary available.

The basic idea is that C:\Program Files\Git\mingw64\ is your / directory according to Git Bash (note: depending on how you installed it, the directory might be different. from the start menu, right click on the Git Bash icon and open file location. It might be something like C:\Users\name\AppData\Local\Programs\Git, the mingw64 in this directory is your root. Find it by using pwd -W). If you go to that directory, you will find the typical linux root folder structure (bin, etc, lib and so on).

If you are missing a utility, such as wget, track down a binary for windows and copy the files to the corresponding directories. Sometimes the windows binary have funny prefixes, so

KartikTalwar

The fastest remote directory rsync over ssh archival I can muster (40MB/s over 1gb NICs)

This creates an archive that does the following:

rsync (Everyone seems to like -z, but it is much slower for me)

• a: archive mode - rescursive, preserves owner, preserves permissions, preserves modification times, preserves group, copies symlinks as symlinks, preserves device files.
• H: preserves hard-links
• A: preserves ACLs

wych42

[Unit]
Description=Clash service
After=network.target

[Service]

[Service]
Type=simple
StandardError=journal
User=clash

nepsilon

How to use ssh-agent to cache your SSH credentials?

Contributed by Fabien Loudet, Linux SysAdmin at Rosetta Stone

Tired of always having to enter your SSH key passphrase when logging in to remote machines? Here comes ssh-agent. Enter the passphrase once and it will keep it in memory for you

Using ssh-agent in your shell session:

batok

import paramiko
k = paramiko.RSAKey.from_private_key_file("/Users/whatever/Downloads/mykey.pem")
c = paramiko.SSHClient()
c.set_missing_host_key_policy(paramiko.AutoAddPolicy())
print "connecting"
c.connect( hostname = "www.acme.com", username = "ubuntu", pkey = k )
print "connected"
commands = [ "/home/ubuntu/firstscript.sh", "/home/ubuntu/secondscript.sh" ]
for command in commands:
	print "Executing {}".format( command )

bzerangue

Binding and Unbinding to Active Directory from Mac OS via Command Line

• Open the Terminal Application
• Type in sudo -i and type in your Mac Administrator account password. sudo gives you root level or administrator level privileges.

To View current Active Directory Settings

dsconfigad -show

To Unbind a Computer from an Active Directory Domain

splaspood

cfg.parser () {
    fixed_file=$(cat $1 | sed 's/ = /=/g')  # fix ' = ' to be '='
    IFS=$'\n' && ini=( $fixed_file )              # convert to line-array
    ini=( ${ini[*]//;*/} )                   # remove comments
    ini=( ${ini[*]/#[/\}$'\n'cfg.section.} ) # set section prefix
    ini=( ${ini[*]/%]/ \(} )                 # convert text2function (1)
    ini=( ${ini[*]/=/=\( } )                 # convert item to array
    ini=( ${ini[*]/%/ \)} )                  # close array parenthesis
    ini=( ${ini[*]/%\( \)/\(\) \{} )         # convert text2function (2)
    ini=( ${ini[*]/%\} \)/\}} )              # remove extra parenthesis

kwilczynski

If you want to check whether a node run_list includes a specific role (upon expansion), then you could use role? method on the Node object:

node.role?('name')

Alternatively, you can see whether either would work for you:

node.roles.include?('name')

node.run_list?('role[name]')